Mstislavskiy M. M.: Regularities in the formation of manganese deposits on continents. In: Acta mineralogica-petrographica, (28). pp. 21-35. (1986)
Előnézet |
Cikk, tanulmány, mű
mineralogica_028_021-035.pdf Letöltés (1MB) | Előnézet |
Absztrakt (kivonat)
The destructive type of tectonic regimes directly controlled the formation of the larger part of primary manganese deposits. Recurrences of these regimes in the history of the Earth marked the periodicity of the active manganese-forming epochs. The main body of the manganese ores was deposited in as late as the Early Proterozoic, after the protoplatforms have appeared. In the Archean, the formation of the lowermost crust (lithosphere) stimulated the isomorphic dissemination of manganese, thus raising the dark of the metal in basites and ultrabasites. The taphrogenic rifting on cratons was the major ore-forming regime during the thalassocratic periods in the evolution of the Earth. On the contrary, the geocratic accretive period of the Pangaea formation was less favourable for manganese concentration. On the supercontinents, the manganese deposits practically did not appear in the orogenic and trappean magmatic zones and in the regions of hypergenic crustal formation. The latter regions are favourable for bauxite formation, but not for manganese concentration in the original rocks with the dark of the metal. Secondary manganese deposits appear only in the originally specified manganese-bearing formations. The epochs of bauxite formation and of initial manganese concentration are antipathic. The separation of iron from manganese in the formation of deposits occurred mostly under endogenic conditions. The accumulation of ferruginous ores is characterised by tholeiite, spilite-keratophyric magmatism, whereas the manganese deposits require a more acid and alkalic geochemical regime with a higher effect of fluids. The described genetic conception provides ways of elaborating new criteria for prospecting of manganese deposits.
| Mű típusa: | Cikk, tanulmány, mű |
|---|---|
| Befoglaló folyóirat/kiadvány címe: | Acta mineralogica-petrographica |
| Dátum: | 1986 |
| Kötet: | 28 |
| ISSN: | 0365-8066 |
| Oldalak: | pp. 21-35 |
| Nyelv: | angol |
| Kiadó: | University of Szeged, Department of Mineralogy, Geochemistry and Petrology |
| Kiadás helye: | Szeged |
| Befoglaló mű URL: | http://acta.bibl.u-szeged.hu/39406/ |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Megjegyzések: | Bibliogr.: p. 34-35. ; ill. ; összefoglalás angol nyelven |
| Szakterület: | 01. Természettudományok 01. Természettudományok > 01.05. Föld- és kapcsolódó környezettudományok |
| Feltöltés dátuma: | 2016. okt. 17. 09:25 |
| Utolsó módosítás: | 2022. júl. 26. 13:19 |
| URI: | http://acta.bibl.u-szeged.hu/id/eprint/24745 |
 |
Tétel nézet |
